System and method for limiting access to data
US6882729B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 12, 2002 |
| Grant date | Apr 19, 2005 |
| Priority date | — |
| Expiry date | Dec 12, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2209/80
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A data system includes a secured appliance capable of receiving broadcast programming and a remote control used to transmit data frames to the secured appliance. The secured appliance is provided with a decryption key that is complimentary to an encryption key provided to the remote control. The encryption key is used to encrypt at least a part of a data frame transmitted by the remote control to the secured appliance, the data frame including data for commanding an operation of the secured appliance. The remote control cannot be used to command certain operations of the secured appliance until such time as the decryption key is supplied to the secured appliance thus effectively limiting the ability to use the secured appliance to access the broadcast programming.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.